Ancient Earth rock found on the moon


What may be the oldest-known Earth rock has turned up in a surprising place: the moon. A 2-centimeter chip embedded in a larger rock collected by Apollo astronauts is actually a 4-billion-year-old fragment of our own planet, scientists say.

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The northern and southern lights are different. Here’s why


The northern lights (above) and their lesser-known sibling the southern lights, aurora borealis and aurora australis, respectively, undulate across the skies in hazy green and sometimes red ribbons near Earth’s polar regions. The two phenomena aren’t identical, however, and now researchers think they know why.

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A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements


From certain angles, the Flerov Laboratory of Nuclear Reactions here looks more like an auto repair shop than a legendary scientific institute. Scientists in dirty blue smocks walk around while an oil pump thumps out a techno beat. Tables are strewn with bolts and cleaning fluids, including a vodka bottle half full of ethanol. And spare parts are everywhere—bins, shelves, whole walls full of metal whatsits in all manner of disrepair.

All that stuff serves the lab’s six particle accelerators, some of which resemble huge mechanical caterpillars, with dozens of tractor-green segments winding through entire rooms. Or multiple rooms: When equipment doesn’t fit, researchers knock holes in walls and thread things through the concrete. Seeing the whole of an accelerator requires some serious gymnastika, scaling perilously steep stairs and dodging anacondas of hanging wires. The pipes you duck under bear warning signs to watch out—not for your head, but for the equipment. At Flerov, particles have the right of way.

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How to Protect Your Knees


Knees are sort of like a Swiss army knife. They help you sit, stand, lift, walk, run, and jump. But they also have lots of parts that can get injured.

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